Temporary Fix:
To temporarily fix the problem doctors would probably start your baby on a medicine called Prostaglandin which opens communication between the two hallways called Ductus Arteriosis.

This forces the blood in the two hallways to mix so some of the blue blood in the aortic hallway gets to go to the Pulmonic hallway to get some oxygen and come back so the baby will be less blue. Sometimes this is enough.

Frequently that is not enough and your child may have to undergo an immediate Cardiac Casterization procedure which requires creating a hole between the back rooms of the heart (Aterial Septestomy) to force the pink and blue blood to mix.

How to Fix:
To permanently fix the problem doctors do an operation to switch the two arteries, called a Switch Operation where the two arteries are "switched" so the heart can function normally.